/Engine/Source/Runtime/CoreUObject/Public/Misc/PackageName.h
Deprecated* Specifying AllowTextFormats is no longer supported. Text format is instead specified as a field on the result struct from IPackageResourceManager->OpenReadPackage.
static bool FindPackageFileWithoutExtension ( const [FString](API\Runtime\Core\Containers\FString) & InPackageFilename, [FString](API\Runtime\Core\Containers\FString) & OutFilename, bool InAllowTextFormats )